Somehow this bug made it all the way through internal testing and publicbeta before being discovered. Intriguing... Anyhow:

Apple has addressed this bug by releasing a macOS High Sierra 10.13Supplemental Update, available from the Updates tab in the Mac AppStore. Apple has also shared a support document outlining steps to backup, erase, and restore the encrypted APFS volume upon updating.

<https://support.apple.com/HT208168>

The bug has also been fixed in the base version of macOS High Sierra forthose who have yet to install the full software update.

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